<template>
  <div class="list" ref="wrapper">
      <div>
    <div class="area">
      <div class="title" border-topbottom>当前城市</div>
      <div class="button-list">
        <div class="button-wrapper">
          <div class="button" >
            {{this.currentCity}}
            </div>
        </div>
      </div>
    </div>
    <div class="area">
      <div class="title" border-topbottom>热门城市</div>
      <div class="button-list" >
        <div class="button-wrapper"
         v-for="item in hot"
          :key="item.id"
           @click="handleCityClick(item.name)">
          <div class="button">{{item.name}}</div>
        </div>
      </div>
    </div>
    <div class="area" v-for = "(item,key) in cities" :key="key" :ref="key">
      <div class="title" border-topbottom>{{key}}</div>
      <div class="item-list" border-topbottom >
        <div class="item"
         v-for="innerItem in item" 
         :key="innerItem.id"
         @click="handleCityClick(innerItem.name)">
          {{innerItem.name}}
          </div>
      </div>
    </div>
    </div>
  </div>
</template>
<script>
import Bscroll from 'better-scroll'
import {mapMutations, mapState} from 'vuex'
export default {
  name: "CityList",
  props:{
      hot:Array,
      cities:Object,
      letter:String
  },
  methods:{
     handleCityClick(city){
       this.changeCity(city)
       this.$router.push('/')
     },
     ...mapMutations(['changeCity'])
  },
  computed:{
    ...mapState({
      currentCity:'city'
    })
  },
  mounted (){
      this.scroll = new Bscroll(this.$refs.wrapper)
  },
  watch:{
    letter () {
       if(this.letter){
    
         const element = this.$refs[this.letter][0]
         this.scroll.scrollToElement (element)
       }
      
    }
  }
};
</script>
<style lang="stylus" scoped>
.list
  position: absolute
  overflow: hidden
  top: 1.58rem
  left: 0
  right: 0
  bottom: 0


.area 
  border-top: 1px solid #ccc
  border-bottom: 1px solid #ccc


.title 
  line-height: 0.6rem
  background: #eee
  padding-left: 0.2rem
  color: #666
  font-size: 0.26rem


.button-list 
  overflow: hidden
  padding: 0.1rem 0.6rem 0.1rem 0.1rem


.button-wrapper 
  float: left
  width: 33.33%


.button 
  padding: 0.1rem 0
  text-align: center
  margin: 0.1rem
  border: 0.02rem solid #ccc
  border-radius: 0.06rem


.item-list
  .item 
    line-height: 0.76rem;
    padding-left: 0.2rem;
    border-bottom: 0.01rem solid #ccc;
  
</style>
